<template>
    <div>
        <!-- 面包屑导航区域 -->
            <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片试图区域 -->
        <el-card>
            <!-- 消息提示 -->
            <el-alert title="添加商品信息" type="info" center show-icon></el-alert>

            <!-- 步骤条组件 -->
            <el-steps align-center :active="activeIndex - 0" finish-status="success">
                <el-step title="基本信息" description=""></el-step>
                <el-step title="商品参数" description=""></el-step>
                <el-step title="商品属性" description=""></el-step>
                <el-step title="商品图片" description=""></el-step>
                <el-step title="商品内容" description=""></el-step>
                <el-step title="完成" description=""></el-step>
            </el-steps>

            <!-- 表单区域 -->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
                <!-- tab栏切换 -->
                <el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave="beforeTabLeave" @tab-click="tabClicked">
                    <!-- 基本信息 -->
                    <el-tab-pane label="基本信息" name="0">
                        <el-form-item label="商品名称" prop="goods_name">
                            <el-input v-model="addForm.goods_name"></el-input>
                        </el-form-item>
                        <el-form-item label="商品价格" prop="goods_price">
                            <el-input v-model="addForm.goods_price" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品重量" prop="goods_weight">
                            <el-input v-model="addForm.goods_weight" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品数量" prop="goods_number">
                            <el-input v-model="addForm.goods_number" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品分类" prop="goods_cat">
                            <!-- 选择商品分类的级联选择框 -->
                            <el-cascader expandTrigger='hover' v-model="addForm.goods_cat" :options="cateList" :props="cateProps" @change="handleChange" clearable></el-cascader>
                        </el-form-item>
                    </el-tab-pane>

                    <!-- 商品信息 -->
                    <el-tab-pane label="商品参数" name="1">
                        <!-- 渲染表单item项 -->
                        <el-form-item :label="item.attr_name" :key="item.attr_id" v-for="item in manyTableData">
                            <!-- 使用数组渲染复选框 -->
                            <el-checkbox-group v-model="item.attr_vals">
                                <el-checkbox border :label="val" v-for="(val,i) in item.attr_vals" :key="i"></el-checkbox>
                            </el-checkbox-group>
                        </el-form-item>
                    </el-tab-pane>

                    <!-- 商品属性 -->
                    <el-tab-pane label="商品属性" name="2">
                        <!-- 循环生成静态属性 -->
                        <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
                            <el-input v-model="item.attr_vals"></el-input>
                        </el-form-item>
                    </el-tab-pane>

                    <!-- 商品图片 -->
                    <el-tab-pane label="商品图片" name="3">
                        <el-upload :action="uploadURL" :on-preview="handlePreview" :on-remove="handleRemove" :on-success="handleSuccess" list-type="picture" :headers="headerObj">
                            <el-button size="small" type="primary">点击上传</el-button>
                        </el-upload>
                    </el-tab-pane>

                    <!-- 商品内容 -->
                    <el-tab-pane label="商品内容" name="4">
                        <!-- 富文本编辑器组件 -->
                        <quill-editor v-model="addForm.goods_introduce"></quill-editor>
                        <!-- //添加商品按钮 -->
                        <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
                    </el-tab-pane>
                </el-tabs>
            </el-form>

        </el-card>

        <!-- 预览图片对话框 -->
        <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
            <img :src="previewPath" class="previewImg" />
        </el-dialog>

    </div>
</template>

<script>

// 导入loadash
import _ from 'lodash'

export default ({
    data() {
        return {
            // 保存步骤条激活项索引
            activeIndex: '0',
            //添加商品的表单数据对象
            addForm: {
                goods_name: '',
                goods_price: 0,
                goods_weight: 0,
                goods_number: 0,
                goods_cat: [],
                //上传图片数组
                pics: [],
                //商品的详情介绍
                goods_introduce: '',
                attrs: []
            },
            //验证规则
            addFormRules: {
                goods_name: [
                    { required: true, message: '请输入商品名称', trigger: 'blur' }
                ],
                goods_price: [
                    { required: true, message: '请输入商品价格', trigger: 'blur' }
                ],
                goods_weight: [
                    { required: true, message: '请输入商品重量', trigger: 'blur' }
                ],
                goods_number: [
                    { required: true, message: '请输入商品数量', trigger: 'blur' }
                ],
                goods_cat: [
                    { required: true, message: '请输入商品分类', trigger: 'blur' }
                ]
            },
            //用来保存分类数据
            cateList: [],
            //配置级联菜单中数据如何展示
            cateProps: {
                value: 'cat_id',
                label: 'cat_name',
                children: 'children'
            },
            //动态列表参数
            manyTableData: [],
            //静态属性列表
            onlyTableData: [],
            // 上传图片的url地址
            uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
            //图片上传组件的headers请求头对象
            headerObj: { Authorization: window.sessionStorage.getItem('token') },
            //保存预览图片的url地址
            previewPath: '',
            //控制预览图片对话框的显示和隐藏
            previewVisible: false
        }
    },
    created() {
        this.getCateList()
    },
    methods: {
        async getCateList() {
            const { data:res } = await this.$http.get('categories');

            if (res.meta.status !== 200) {
                return this.$message.error('获取商品分类数据失败');
            };
            this.cateList = res.data;
        },
        handleChange() {
            //如果用户选中的不是三级分类该选择项无效
            if (this.addForm.goods_cat.length !== 3) {
                this.addForm.goods_cat = [];
                return
            }
        },
        //切换tab栏选项
        beforeTabLeave(activeName, oldActiveName) {
            //在tab栏切换之前触发 形参为tab切换前，后的name值
            if (oldActiveName === '0') {
                //在第一个标签页的时候
                //用户不输入某些必选内容 返回false阻止往下执行
                if (this.addForm.goods_cat.length !== 3) {
                    this.$message.error('请选择分类');
                    return false;
                } else if (this.addForm.goods_name.trim() === '') {
                    this.message.error('请输入商品名称');
                    return false;
                } else if (this.addForm.goods_price.trim() === '0') {
                    this.$message.error('请输入商品价格');
                    return false;
                } else if (this.addForm.goods_weight.trim() === '0') {
                    this.$message.error('请输入商品重量');
                    return false;
                } else if (this.addForm.goods_number.trim() === '0') {
                    this.$message.error('请输入商品数量');
                    return false;
                }
            }
        },
        //切换tab栏时触发
        async tabClicked() {
            console.log(this.activeIndex)
            // 判断是否为商品信息栏
            if (this.activeIndex === '1') {
                const { data: res } = await this.$http.get(
                    `categories/${this.cateId}/attributes`,
                    { params: {sel: 'many'} }
                )
                if (res.meta.status !== 200) {
                    return this.$message.error('获取动态参数列表失败');
                };
                // console.log({data:res})
                //将attr_vals字符串转换为数组
                res.data.forEach(item => {
                    item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ');
                });
                this.manyTableData = res.data;
            } else if (this.activeIndex === '2') {
                //发送请求获取动态属性
                const { data: res } = await this.$http.get(
                    `categories/${this.cateId}/attributes`,
                    { params: {sel: 'only'} }                   
                )
                if (res.meta.status !== 200) {
                    return this.$message.error('获取静态属性列表失败');
                };   
                this.onlyTableData = res.data;             
            }
        },
        //用户点击图片进行预览时执行
        handlePreview(file) {
            //形参file表示用户预览的当前的文件
            this.previewPath = file.response.data.url;
            // 显示预览图片对话框
            this.previewVisible = true
        },
        //用户点击x号删除时执行
        handleRemove(file) {
            //形参file表示用户点击删除的文件
            //获取用户点击删除的那个图片的临时路径
            const filePath = file.response.data.tmp_path;
            // 使用findIndex来查找符合条件的索引
            const index = this.addForm.pics.findIndex(item => item.pic === filePath);
            //移除索引对应的图片
            this.addForm.pics.splice(index, 1)
        },
        //图片上传成功时触发
        handleSuccess(response) {
            // 形参response表示上传成功之后服务器返回的结构
            // 将服务器返回的临时路径保存到addForm表单的pics数组中
            this.addForm.pics.push( { pic: response.data.tmp_path } )
        },
        //编写点击事件完成商品添加
        add() {
            this.$refs.addFormRef.validate(async valid => {
                if (!valid) return this.$message.error('请填写必要的表单项');

                // 将addForm进行深拷贝，避免goods_cat数组转换字符串后导致级联选择器报错
                const form = _.cloneDeep(this.addForm);
                // console.log(form)
                //将goods_cat从数组转换为字符串
                form.goods_cat = form.goods_cat.join(',');
                // 处理attrs数组，数组中包含商品的动态参数和静态属性
                this.manyTableData.forEach( item => {
                    const newInfo = {
                        attr_id: item.attr_id,
                        attr_value: item.attr_vals.join(' ')
                    };
                    this.addForm.attrs.push(newInfo);
                });
                this.onlyTableData.forEach( item => {
                    const newInfo = {
                        attr_id: item.attr_id,
                        attr_value: item.attr_vals
                    };
                    this.addForm.attrs.push(newInfo);
                });

                form.attrs = this.addForm.attrs;
                console.log(form);
                // 发送请求完成商品的添加 商品名称要唯一
                const { data: res } = await this.$http.post('goods', form);
                if (res.meta.status !== 201) {
                    return this.$message.error('添加商品失败')
                };
                this.$message.success('添加商品成功');
                //编程式导航跳转到商品列表
                this.$router.push('/goods')
            })
        }
    },
    computed: {
        cateId() {
            if (this.addForm.goods_cat.length === 3) {
                return this.addForm.goods_cat[2]
            }
            return null
        }
    }
})
</script>

<style lang="less" scoped>
    .el-checkbox {
        margin: 0 10px 0 0 !important
    }
    .previewImg {
        width: 100%;
        height: 100%;
    }
    .quill-editor {
        min-height: 300px;
    }
    .btnAdd {
        margin-top: 15px;
    }
</style>
